Hi, this problem had bothered me for a very long time one month ago. I
used a flash disk to host the root partition to solve the problem. But
after a month, I find the flash disk was easily lost data even with
readonly all the time. So I moved back to hard disk. But the unionfs
solution seems works well to solve this problem:

I'm using ubuntu AMD64, I found that /etc/mtab and /etc/hosts was access
all the time. So if we mount etc into memory, the hard disk click will
stopped immediately.

Put the following lines into the proper position of
/etc/init.d/mountkernfs.sh:

/bin/mount -v -n --bind /etc /unionfs/ro/etc
/bin/mount -v -n -t unionfs -o dirs=/unionfs/mem/etc=rw:/unionfs/ro/etc=ro 
unionfs /etc

And you also need to put another script in rc0.d and rc6.d to save the
changes in etc. And one in rcS.d to restore the changes. Otherwise all
changes to etc will lost after a reboot.

-- 
hard disk being accessed every 4 sec.
https://bugs.launchpad.net/bugs/17878
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